摘要
对于一些长期在中温条件下服役的Cr-Mo钢(2.25Cr1Mo),由于钢中P、S等有害杂质元素在服役过程中不断向晶界偏聚,降低了晶界结合力,致使该类钢出现第二类回火脆性这一关键问题。为了探寻降低这类Cr-Mo钢第二类回火脆性倾向的有效方法,提高材料安全服役可靠性,从溶质元素偏聚机制出发,总结分析了合金元素晶界偏聚及改善钢第二类回火脆性的内在本质,重点归纳了几种常见元素的晶界偏聚行为及其对钢回火脆性的影响,同时还客观分析了理论计算和试验研究在阐释合金元素对晶界脆性影响存在差异的主要原因,期望能为中温用钢长期服役过程中存在的回火脆性提供一些有效控制方法,也为合金元素晶界偏聚行为的研究提供一些参考。
For some Cr-Mo steels(2.25Cr1Mo)which are usually serviced at medium temperature for a long time,the critical problem of the second type temper embrittlement is existed in these steels because of the continuous segregations of P,S and other harmful impurities to the grain boundary during the service.In order to explore some effective methods to reduce the temper embrittlement tendency of this kind of Cr-Mo steels and improve the reliability of the material,starting from the segregation mechanism of solute elements,the intrinsic essences of alloy elements segregation at grain boundary and its function on improving the temper brittleness of steel were analyzed.The segregation phenomena of several common elements and their influence on temper embrittlement of steel were mainly summarized.At the same time,the main reasons for the difference between theoretical calculation and experimental study are also analyzed.It is expected to provide some effective methods for temper embrittlement of medium temperature steel during long-term service,and offer some references for the study of grain boundary segregation behavior of alloying elements in future.
作者
李小兵
董鑫
邢炜伟
陈波
刘奎
马颖澈
LI Xiao-bing;DONG Xin;XING Wei-wei;CHEN Bo;LIU Kui;MA Ying-che(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,Liaoning,China;School of Materials and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China)
出处
《钢铁》
CAS
CSCD
北大核心
2021年第3期1-12,共12页
Iron and Steel
基金
国家自然科学基金资助项目(51801210)。
关键词
第二类回火脆性
晶界偏聚
CR-MO钢
合金元素
俄歇电子谱仪(AES)
the second type temper embrittlement
segregation at grain boundary
Cr-Mo steel
alloying element
auger electron spectroscopy(AES)
作者简介
李小兵(1988—),男,博士,副研究员,E-mail:xbli@imr.ac.cn。
